Environmentally friendly nanocrystalline magnesium hydride decorated with metallic glassy-zirconium palladium nanopowders for fuel cell applications

El‐Eskandarany, M. Sherif; Banyan, Mohammad; Al-Ajmi, Fahad

doi:10.1039/c9ra05121j

Cited by 8 publications

(7 citation statements)

References 33 publications

(40 reference statements)

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“…Besides, this technique was used to identify the crystallization behavior of a-Zr 2 Cu powders. The DSC procedure and analysis were shown elsewhere 45 – 47 .…”

Section: Methodsmentioning

confidence: 99%

“…It is reported that employing such a metastable amorphous phase led to significant improvement in the kinetics characteristics of MgH 2 23 . As yet, the literature reports on using amorphous/metallic glassy alloys are fewer 29 , 46 , 47 when compared with the traditional alloys and compounds.…”

Section: Introductionmentioning

confidence: 95%

“…. As yet, the literature reports on using amorphous/metallic glassy alloys are fewer 29,46,47 when compared with the traditional alloys and compounds.…”

mentioning

confidence: 96%

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From gangue to the fuel-cells application

El‐Eskandarany

Al–Salem

Ali

et al. 2020

Sci Rep

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Hydrogen, which is a new clean energy option for future energy systems possesses pioneering characteristics making it a desirable carbon-free energy carrier. Hydrogen storage plays a crucial role in initiating a hydrogen economy. Due to its low density, the storage of hydrogen in the gaseous and liquids states had several technical and economic challenges. Despite these traditional approaches, magnesium hydride (MgH2), which has high gravimetric and volumetric hydrogen density, offers an excellent potential option for utilizing hydrogen in automobiles and other electrical systems. In contrast to its attractive properties, MgH2 should be mechanically and chemically treated to reduce its high activation energy and enhance its modest hydrogen sorption/desorption kinetics. The present study aims to investigate the influence of doping mechanically-treated Mg metal with 5 wt% amorphous Zr2Cu abrasive nanopowders in improving its kinetics and cyclability behaviors. For the first time, solid-waste Mg, Zr, and Cu metals were utilized for preparing MgH2 and amorphous Zr2Cu alloy (catalytic agent), using hydrogen gas-reactive ball milling, and arc melting techniques, respectively. This new nanocomposite system revealed high-capacity hydrogen storage (6.6 wt%) with superior kinetics and extraordinary long cycle-life-time (1100 h) at 250 °C.

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“…Besides, this technique was used to identify the crystallization behavior of a-Zr 2 Cu powders. The DSC procedure and analysis were shown elsewhere 45 – 47 .…”

Section: Methodsmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 95%

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From gangue to the fuel-cells application

El‐Eskandarany

Al–Salem

Ali

et al. 2020

Sci Rep

Self Cite

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“…In addition to the useful applications of Mg in a wide range of industrial sectors (e.g., automotive, aerospace, medical, and electronics applications) it has been considered as a promising candidate material for solid-state hydrogen storage applications [11][12][13][14]. Metallic Mg possesses a unique combination of high gravimetric (7.60 wt%) and volumetric (110 g/L) hydrogen storage capacities, as well as a good cyclability [15]. It should be noted that tetragonal magnesium hydride (MgH 2 ) in β-phase is a very stable compound in a thermodynamic sense, requiring elevated temperatures to decompose (>350 • C) [14].…”

Section: Nano-mg As a Solid-state Hydrogen Storage Materialsmentioning

confidence: 99%

Solid-State Conversion of Magnesium Waste to Advanced Hydrogen-Storage Nanopowder Particles

2020

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Recycling of metallic solid-waste (SW) components has recently become one of the most attractive topics for scientific research and applications on a global scale. A considerable number of applications are proposed for utilizing metallic SW products in different applications. Utilization of SW magnesium (Mg) metal for tailoring high-hydrogen storage capacity nanoparticles has never been reported as yet. The present study demonstrates the ability to produce pure Mg ingots through a melting and casting approach from Mg-machining chips. The ingots were used as a feedstock material to produce high-quality Mg-ribbons, using a melting/casting and spinning approaches. The ribbons were then subjected to severe plastic deformation through the cold rolling technique. The as-cold roll Mg strips were then snipped into small shots before charging them into reactive ball milling. The milling process was undertaken under high-pressure of pure hydrogen gas (H2), where titanium balls were used as milling media. The final product obtained after 100 h of milling showcased excellent nanocrystalline structure and revealed high hydro/dehydrogenation kinetics at moderate temperature (275 °C). The present study shows that primer cold rolling of Mg-strips before reactive ball milling is a necessary step to prepare ultrafine magnesium hydride (MgH2) nanopowders with advanced absorption/desorption kinetics behavior. These ultrafine powders with their nanocrystalline structure are believed to play an important role in effective gas diffusion process. Moreover, the fine titanium particles came from the ball-powder-ball collisions and introduced to the Mg matrix have not only acted as micro-scaled milling media, but they played a vital catalyzation role for the process.

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“…The unfavorable aptness of the industrialized production of ZrN may lead to restriction of the mass production of such advanced material. Apart from the high-temperature/high-pressure approaches, the reactive ball milling (RBM) technique was introduced at the beginning of the 1990 s [ 23 , 24 ] and has been widely accepted for preparing metallic nitrides [ 25 , 26 ] and hydrides [ 27 ] at ambient temperature through high-energy ball milling. This process is a simplistic method that has proven its viability in such works many times over.…”

Section: Introductionmentioning

confidence: 99%

Top-Down Reactive Approach for the Synthesis of Disordered ZrN Nanocrystalline Bulk Material from Solid Waste

2020

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Transition metal nitrides possess superior mechanical, physical, and chemical properties that make them desirable materials for a broad range of applications. A prime example is zirconium nitride (ZrN), which can be obtained through different fabrication methods that require the applications of high temperature and pressure. The present work reports an interesting procedure for synthesizing disordered face centered cubic (fcc)-ZrN nanoparticles through the reactive ball milling (RBM) technique. One attractive point of this study is utilizing inexpensive solid-waste (SW) zirconium (Zr) rods as feedstock materials to fabricate ZrN nanopowders. The as-received SW Zr rods were chemically cleaned and activated, arc-melted, and then disintegrated into powders to obtain the starting Zr metal powders. The powders were charged and sealed under nitrogen gas using a pressurized milling steel vial. After 86 ks of milling, a single fcc-ZrN phase was obtained. This phase transformed into a metastable fcc-phase upon RBM for 259 ks. The disordered ZrN powders revealed good morphological characteristics of spherical shapes and ultrafine nanosize (3.5 nm). The synthetic ZrN nanopowders were consolidated through a spark plasma sintering (SPS) technique into nearly full-density (99.3% of the theoretical density for ZrN) pellets. SPS has proven to be an integral step in leading to desirable and controlled grain growth. Moreover, the sintered materials were not transformed into any other phase(s) upon consolidation at 1673 K. The results indicated that increasing the RBM time led to a significant decrease in the grain size of the ZrN powders. As a result, the microhardness of the consolidated samples was consequently improved with increasing RBM time.

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Environmentally friendly nanocrystalline magnesium hydride decorated with metallic glassy-zirconium palladium nanopowders for fuel cell applications

Abstract: A new solid-state hydrogen storage system of magnesium hydride (MgH2) doped with 5 wt% of metallic glassy (MG) zirconium palladium (Zr2Pd) nanopowder was fabricated using a high-energy ball milling technique.

Cited by 8 publications

References 33 publications

From gangue to the fuel-cells application

From gangue to the fuel-cells application

Solid-State Conversion of Magnesium Waste to Advanced Hydrogen-Storage Nanopowder Particles

Top-Down Reactive Approach for the Synthesis of Disordered ZrN Nanocrystalline Bulk Material from Solid Waste

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